source3/smbd/notify_msg.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  *
   4  * Copyright (C) Volker Lendecke 2014
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "librpc/gen_ndr/notify.h"
  22 #include "librpc/gen_ndr/messaging.h"
  23 #include "lib/dbwrap/dbwrap.h"
  24 #include "lib/dbwrap/dbwrap_rbt.h"
  25 #include "lib/util/server_id.h"
  26 #include "messages.h"
  27 #include "proto.h"
  28 #include "globals.h"
  29 #include "tdb.h"
  30 #include "util_tdb.h"
  31 #include "lib/util/server_id_db.h"
  32 #include "smbd/notifyd/notifyd.h"
  33
  34 struct notify_context {
  35         struct server_id notifyd;
  36         struct messaging_context *msg_ctx;
  37
  38         struct smbd_server_connection *sconn;
  39         void (*callback)(struct smbd_server_connection *sconn,
  40                          void *private_data, struct timespec when,
  41                          const struct notify_event *ctx);
  42 };
  43
  44 static void notify_handler(struct messaging_context *msg, void *private_data,
  45                            uint32_t msg_type, struct server_id src,
  46                            DATA_BLOB *data);
  47 static int notify_context_destructor(struct notify_context *ctx);
  48
  49 struct notify_context *notify_init(
  50         TALLOC_CTX *mem_ctx, struct messaging_context *msg,
  51         struct tevent_context *ev,
  52         struct smbd_server_connection *sconn,
  53         void (*callback)(struct smbd_server_connection *sconn,
  54                          void *, struct timespec,
  55                          const struct notify_event *))
  56 {
  57         struct server_id_db *names_db;
  58         struct notify_context *ctx;
  59         NTSTATUS status;
  60
  61         ctx = talloc(mem_ctx, struct notify_context);
  62         if (ctx == NULL) {
  63                 return NULL;
  64         }
  65         ctx->msg_ctx = msg;
  66
  67         ctx->sconn = sconn;
  68         ctx->callback = callback;
  69
  70         names_db = messaging_names_db(msg);
  71         if (!server_id_db_lookup_one(names_db, "notify-daemon",
  72                                      &ctx->notifyd)) {
  73                 DEBUG(1, ("No notify daemon around\n"));
  74                 TALLOC_FREE(ctx);
  75                 return NULL;
  76         }
  77
  78         {
  79                 struct server_id_buf tmp;
  80                 DBG_DEBUG("notifyd=%s\n",
  81                           server_id_str_buf(ctx->notifyd, &tmp));
  82         }
  83
  84         if (callback != NULL) {
  85                 status = messaging_register(msg, ctx, MSG_PVFS_NOTIFY,
  86                                             notify_handler);
  87                 if (!NT_STATUS_IS_OK(status)) {
  88                         DEBUG(1, ("messaging_register failed: %s\n",
  89                                   nt_errstr(status)));
  90                         TALLOC_FREE(ctx);
  91                         return NULL;
  92                 }
  93         }
  94
  95         talloc_set_destructor(ctx, notify_context_destructor);
  96
  97         return ctx;
  98 }
  99
 100 static int notify_context_destructor(struct notify_context *ctx)
 101 {
 102         if (ctx->callback != NULL) {
 103                 messaging_deregister(ctx->msg_ctx, MSG_PVFS_NOTIFY, ctx);
 104         }
 105
 106         return 0;
 107 }
 108
 109 static void notify_handler(struct messaging_context *msg, void *private_data,
 110                            uint32_t msg_type, struct server_id src,
 111                            DATA_BLOB *data)
 112 {
 113         struct notify_context *ctx = talloc_get_type_abort(
 114                 private_data, struct notify_context);
 115         struct notify_event_msg *event_msg;
 116         struct notify_event event;
 117
 118         if (data->length < offsetof(struct notify_event_msg, path) + 1) {
 119                 DEBUG(1, ("message too short: %u\n", (unsigned)data->length));
 120                 return;
 121         }
 122         if (data->data[data->length-1] != 0) {
 123                 DEBUG(1, ("%s: path not 0-terminated\n", __func__));
 124                 return;
 125         }
 126
 127         event_msg = (struct notify_event_msg *)data->data;
 128
 129         event.action = event_msg->action;
 130         event.path = event_msg->path;
 131         event.private_data = event_msg->private_data;
 132
 133         DEBUG(10, ("%s: Got notify_event action=%u, private_data=%p, "
 134                    "path=%s\n", __func__, (unsigned)event.action,
 135                    event.private_data, event.path));
 136
 137         ctx->callback(ctx->sconn, event.private_data, event_msg->when, &event);
 138 }
 139
 140 NTSTATUS notify_add(struct notify_context *ctx,
 141                     const char *path, uint32_t filter, uint32_t subdir_filter,
 142                     void *private_data)
 143 {
 144         struct notify_rec_change_msg msg = {};
 145         struct iovec iov[2];
 146         size_t pathlen;
 147         NTSTATUS status;
 148
 149         if (ctx == NULL) {
 150                 return NT_STATUS_NOT_IMPLEMENTED;
 151         }
 152
 153         DEBUG(10, ("%s: path=[%s], filter=%u, subdir_filter=%u, "
 154                    "private_data=%p\n", __func__, path, (unsigned)filter,
 155                    (unsigned)subdir_filter, private_data));
 156
 157         pathlen = strlen(path)+1;
 158
 159         clock_gettime_mono(&msg.instance.creation_time);
 160         msg.instance.filter = filter;
 161         msg.instance.subdir_filter = subdir_filter;
 162         msg.instance.private_data = private_data;
 163
 164         iov[0].iov_base = &msg;
 165         iov[0].iov_len = offsetof(struct notify_rec_change_msg, path);
 166         iov[1].iov_base = discard_const_p(char, path);
 167         iov[1].iov_len = pathlen;
 168
 169         status =  messaging_send_iov(
 170                 ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_REC_CHANGE,
 171                 iov, ARRAY_SIZE(iov), NULL, 0);
 172
 173         if (!NT_STATUS_IS_OK(status)) {
 174                 DEBUG(10, ("messaging_send_iov returned %s\n",
 175                            nt_errstr(status)));
 176                 return status;
 177         }
 178
 179         return NT_STATUS_OK;
 180 }
 181
 182 NTSTATUS notify_remove(struct notify_context *ctx, void *private_data,
 183                        char *path)
 184 {
 185         struct notify_rec_change_msg msg = {};
 186         struct iovec iov[2];
 187         NTSTATUS status;
 188
 189         /* see if change notify is enabled at all */
 190         if (ctx == NULL) {
 191                 return NT_STATUS_NOT_IMPLEMENTED;
 192         }
 193
 194         msg.instance.private_data = private_data;
 195
 196         iov[0].iov_base = &msg;
 197         iov[0].iov_len = offsetof(struct notify_rec_change_msg, path);
 198         iov[1].iov_base = path;
 199         iov[1].iov_len = strlen(path)+1;
 200
 201         status = messaging_send_iov(
 202                 ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_REC_CHANGE,
 203                 iov, ARRAY_SIZE(iov), NULL, 0);
 204
 205         return status;
 206 }
 207
 208 void notify_trigger(struct notify_context *ctx,
 209                     uint32_t action, uint32_t filter,
 210                     const char *dir, const char *name)
 211 {
 212         struct notify_trigger_msg msg;
 213         struct iovec iov[4];
 214         char slash = '/';
 215
 216         DEBUG(10, ("notify_trigger called action=0x%x, filter=0x%x, "
 217                    "dir=%s, name=%s\n", (unsigned)action, (unsigned)filter,
 218                    dir, name));
 219
 220         if (ctx == NULL) {
 221                 return;
 222         }
 223
 224         msg.when = timespec_current();
 225         msg.action = action;
 226         msg.filter = filter;
 227
 228         iov[0].iov_base = &msg;
 229         iov[0].iov_len = offsetof(struct notify_trigger_msg, path);
 230         iov[1].iov_base = discard_const_p(char, dir);
 231         iov[1].iov_len = strlen(dir);
 232         iov[2].iov_base = &slash;
 233         iov[2].iov_len = 1;
 234         iov[3].iov_base = discard_const_p(char, name);
 235         iov[3].iov_len = strlen(name)+1;
 236
 237         messaging_send_iov(
 238                 ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_TRIGGER,
 239                 iov, ARRAY_SIZE(iov), NULL, 0);
 240 }
 241
 242 NTSTATUS notify_walk(struct notify_context *notify,
 243                      bool (*fn)(const char *path, struct server_id server,
 244                                 const struct notify_instance *instance,
 245                                 void *private_data),
 246                      void *private_data)
 247 {
 248         struct tevent_context *ev;
 249         struct tevent_req *req;
 250         struct messaging_rec *rec;
 251         uint64_t log_idx;
 252         NTSTATUS status;
 253         int ret;
 254         bool ok;
 255
 256         ev = samba_tevent_context_init(notify);
 257         if (ev == NULL) {
 258                 return NT_STATUS_NO_MEMORY;
 259         }
 260
 261         req = messaging_read_send(ev, ev, notify->msg_ctx, MSG_SMB_NOTIFY_DB);
 262         if (req == NULL) {
 263                 TALLOC_FREE(ev);
 264                 return NT_STATUS_NO_MEMORY;
 265         }
 266
 267         ok = tevent_req_set_endtime(req, ev, timeval_current_ofs(10, 0));
 268         if (!ok) {
 269                 TALLOC_FREE(ev);
 270                 return NT_STATUS_NO_MEMORY;
 271         }
 272
 273         status = messaging_send_buf(notify->msg_ctx, notify->notifyd,
 274                                     MSG_SMB_NOTIFY_GET_DB, NULL, 0);
 275         if (!NT_STATUS_IS_OK(status)) {
 276                 DEBUG(10, ("%s: messaging_send_buf failed\n",
 277                            nt_errstr(status)));
 278                 TALLOC_FREE(ev);
 279                 return status;
 280         }
 281
 282         ok = tevent_req_poll(req, ev);
 283         if (!ok) {
 284                 DEBUG(10, ("%s: tevent_req_poll failed\n", __func__));
 285                 TALLOC_FREE(ev);
 286                 return NT_STATUS_INTERNAL_ERROR;
 287         }
 288
 289         ret = messaging_read_recv(req, ev, &rec);
 290         if (ret != 0) {
 291                 DEBUG(10, ("%s: messaging_read_recv failed: %s\n",
 292                            __func__, strerror(ret)));
 293                 TALLOC_FREE(ev);
 294                 return map_nt_error_from_unix(ret);
 295         }
 296
 297         ret = notifyd_parse_db(rec->buf.data, rec->buf.length, &log_idx,
 298                                fn, private_data);
 299         if (ret != 0) {
 300                 DEBUG(10, ("%s: notifyd_parse_db failed: %s\n",
 301                            __func__, strerror(ret)));
 302                 TALLOC_FREE(ev);
 303                 return map_nt_error_from_unix(ret);
 304         }
 305
 306         TALLOC_FREE(ev);
 307         return NT_STATUS_OK;
 308 }